对中文问答系统中的问题理解技术进行了研究。问题理解是问答系统的基础,问题理解的核心内容是问题分类。本文对基于规则和统计方法的问题分类体系做了介绍,提出了基于事件框架的问题语义描述模型,给出了疑问意向的形式化定义。同时借助知网,对问题空间的大小进行评测。 The Chinese question answering system in the problem understanding technology was studied. Question understanding is the basis of the question answering system, and the core content of problem understanding is problem classification. This paper introduces the problem classification system based on rules and statistical methods, proposes a question semantic description model based on event framework, and gives the formal definition of question intention. At the same time with the knowledge network, the size of the problem space for evaluation.